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| gonky |
 Posted: 10/31/2005 2:13 AM Post subject: Changeable Combustion |
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Joined: 26 Oct 2005
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Hey guys...
Im not shure if you guys have seen my older post, but I mentioned that I was planning to make and interchangle combustion chamber, So that different sized chamber can be changed, for different styles of shooting, I also asked around and it seems like that doing this is safe.
If you have any upcoming projects, feel free to try, as I am unaware of the changeable chambers causing any troubles yet
gonkz |
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| Animal81182 |
| Posted: 10/31/2005 4:20 AM Post subject: |
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Joined: 07 Sep 2005
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i am sorry i dont quite understand what you are trying to ask???
my combustion launcher has a 2" female thread in the chamber, from this i have got -
1- 2" male thread with plain 2" socket for 2" pipe
2- a 2" male thread -to- 2" male thread now this will take a 1.5" Pipe throught the middle giving me a breach load barrel!!!
Animal  |
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| boilingleadbath |
| Posted: 10/31/2005 6:14 AM Post subject: |
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"different styles of shooting"
Quiet vs. powerful?
Anyway, there is no reason not to have a few different chambers which attach to the barrel with the same [diameter] threads. |
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| Animal81182 |
| Posted: 10/31/2005 6:49 AM Post subject: |
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ah i see sorry my bad -
Why do you want to go to all that trouble?
you want to be thinking about C:B ratio - i.e. the ratio between the volume of the chamber to the volume of the barrel!!!
the optimum C:B ratio for power is 1.5:1 or near as - that means the chamber must be 1.5 times larger than tha barrel!!
if you want the thing to be louder the easiest way is to have a second barrel shorter in length - this will make it louder and less acurate and not travel as far.
Check out http://burntlatke.com/
He has loads of info on ratios and tesat loads of barrel length very informative
Animal |
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| boilingleadbath |
| Posted: 10/31/2005 18:26 PM Post subject: |
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A bigger chamber will give you more preformace for a given barrel. To get quiet opperation out of such a chamber, you'd have to have a obnoxiously lowh barrel; an easy fix is to have a small chamber. While it's not going to be as powerfull, there are situations where you are forced to use a quiet cannon.
One may also point out that the 1.5:1 Vratio (for max power/length) will only apply for linear desins, and will vary between them (if both the chamber and barrel are the same diameter, for instance, the desired Vratio is about .8:1 [simplistic GGDT modle]) |
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| gonky |
| Posted: 11/01/2005 1:52 AM Post subject: |
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| thanx for all your feedback guys, alota help |
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| taterjim |
| Posted: 11/01/2005 21:01 PM Post subject: |
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| I have a small 2" cannon and I can changed the length of the combustion chamber by just screwing in another section of chamber and then follow with the end or clean out cap . Is this the kind of thing you are talking about? Seems like a good plan to me but I don't know if you can get the kind of piece you need when you go above 2". |
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| gonky |
| Posted: 11/02/2005 0:02 AM Post subject: |
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Joined: 26 Oct 2005
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yea, exactly what I am talkin about tater, yea, i have about 6 inches of 4.5" chamber, So they dont make any above 2 "?????
I guess ill just but 4.5" pipe and add adapters to them, easy as that |
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